Originally Posted By: sirquack
Jakeman, calling Jakeman, any ideas. \:\)


I'm only checking in every few days because I'm still holidaying in FL.

In any event Mojo answered your question about why FR changed when you unplug the 600. Its how the waves are interacting betweent the subs. You want the nodes to lessen in the room which happens when a peak and null originating from different subs interact, reinforce or cancel. The fact that you have a peak at 40hz means you need to tweak placement or phase some more.

About the hum. Not much you can do if it occurs when you are plugging subs into different outlets. To get rid of hum in my HT I ran extension cords from one outlet to get several subs on the same ground. Some people use cheater plugs with the ground removed. Also using surge suppressors with 60hz filters on every outlet sometimes helps keep down hum. If it persists I would suggest relocating the subs away from the fronts rather that listen to hum from a speaker.

John